This class implements the Principal interface
and represents a user's Solaris group identification number (GID).

Principals such as this SolarisNumericGroupPrincipal
may be associated with a particular Subject
to augment that Subject with an additional
identity. Refer to the Subject class for more information
on how to achieve this. Authorization decisions can then be based upon
the Principals associated with a Subject.

equals

Compares the specified Object with this
SolarisNumericGroupPrincipal
for equality. Returns true if the given object is also a
SolarisNumericGroupPrincipal and the two
SolarisNumericGroupPrincipals
have the same group identification number (GID).